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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074c702d24664f8c1b04aa3ad3e3be5cfafb4a42c2b9ee9423b398e33d083e4d' 
  AND token = 'mWqBiVDnNogr+5SX/JyRKjdMYmD/rGS1fOcUo4a44EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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