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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a5bb640a3efe24c590bb1ff431a750167ba21a0b0dbcaec8e17d4ea955e78b' 
  AND token = 'M02AoydmvoVb9GLm5vo6ThfPA+d9o1uAEPFIEtC0Ru8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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