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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10305124b0832c867e2b6d0fde6902145554492b6705c929d9b021ea3f782f0' 
  AND token = 'mFPCo5qn017GOOYyCprmj1Vm4ridDuzTYp6+Zmnno9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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