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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea9b45bb1b5adbde7dcde3d1ffdc1c5458d795bd8aee4a2a22589f957f7f80f' 
  AND token = 'K64g1QtGuk+itcilwfBeJGp3lAzUyMRc60yZdSBOmdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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