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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '451ec18ad067505769ca3963ea905f63ad75687a5f43beb8dfacc1717dd6385a' 
  AND token = 'w9GAcvGVnknKka2Yn4AN7wvbzvQ4kW5iERybBN1bxk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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