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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c348316c245389023325e8e97ee45e874b154616e400f5f90f5920bcd75ae1' 
  AND token = 'p/bUY49NmQ1DcSlTIlnwQ7PIn4PybLD6/9I47tpXu1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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