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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a52385f5ad11ddec52aadec13facbb8c8ff6ac5536c94d0a5b9c2f207b6762' 
  AND token = 'qE2sMVWqtPb5L1U2B+hSpIAdG/c+F3BjQi44J19Z0RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00135

JSON explain

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