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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6aaeae774aed32330ad8a1cd0e8b20a1471601fc2fd8b44c4c4b30570dcebf' 
  AND token = 'X/teCSN8g+22Ci2C9vq5sEmZq1l2lFqQV3l3IjCTH5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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