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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b63e6084c25862161a2df9e75e25f09dc3b89c323528a70ffac6c5da8017397' 
  AND token = 'RBQObQVgGE22BCwoAXSAd8AMSmO6Ks1MtzfHLaYBEek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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