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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0268b7ed1f3aff809a03beb52b0c71d079d46aa3e470c97af8a38bb1ea9c12f' 
  AND token = 'G2L5ZkQ0tyr2aKYRYv+TCLCCd8So4JKbqWgB/96U2eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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