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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33ee6584f5a1d859c93f1221fe55cca6a878bb9ca8ba9dc9e8be6f44cf43113' 
  AND token = 'uo933tBRaN8wBThH4wCqQVFN0Rn+7fNxlMb4bzjm+64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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