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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697aa04525ac8f603f9fc8c4952dd9295293836f062b9816bd5e0d3ef8819c11' 
  AND token = 'NP8Mfeb7W1Vb2Pz9kmbt8Z2PZgGqUBLuHXXkGaOzfwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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