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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7edbce8cf2e40616644fa2774413e5ad048cde893e7fc2ca6508a1df9ea5e79a' 
  AND token = 'kT+dK1SecbEUw3ZzQOcTFbJncBSPS0X6loF2P63JGFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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