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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4c194d502113889d481a2675eb13c5e7cb2678bd25707cfdd94739a7ede413' 
  AND token = 'BpIMeZ0u9+OJNMFobMbFnUToxOAEZrRWauBjBcqvOac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}