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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d13c9d351a8a9dea1338c86d473e2ace3150524d44e2636741330e07d1ee9e' 
  AND token = '2SqN1jVXcTdVxclHBLsBn/LpSM/Bnf9xy84jCW4P9FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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