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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9aa1d0f276c4b99aa3d2aa86c78fcf9d6452a3c4054cb21e0f00e9163b3c68' 
  AND token = 'I7GeCgbNjsG8Qm1vayuRy6cFMkS4X2Jw74xBncIccyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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