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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb59b2a9dba3e04d1214dfcaa595c7de0edd14e6f4a1380ccf27c66116521af' 
  AND token = 'EAOh/Eqyb4PEOCr5M72vPS6eLGv3YcpmRa7yl3Bgv1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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