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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8daa8f3a98ff4cbfe3fd97e670e82dd76aa627a1e62a0311c8a42886e8e7c8' 
  AND token = 'bqbL6ezp/FajSNMvPCUrkQ4PD2FKXD6DOn2azYuqI/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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