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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038bc4ba9375630f45fb37b480dc718638f101e497251a604445161e1be4b661' 
  AND token = 'C83vwCNTMRL2I2WgPaVSGNM6Fq0+MOgpeyD5V1D+A04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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