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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c4730ec83bdbd6d17e74f8b96b2f2db24c03a03bf99d98545787cdaa88a38a' 
  AND token = 'Sj57efBe9EPrEuAGuPdMiE2xOV3RTvI1/Ng+4ZS0t1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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