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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315527e80651c6ae80c6b15d5026223639c37771bb03d2939b154706865bb335' 
  AND token = 'ChQltCTppA/O2d65K68MoTgV0bZnjt11CgJHoun4DQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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