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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbdafc6216de31e3ee934da5427deb1141c4f5a3bcf1e2b1252e5475538354b' 
  AND token = 'sCDIAqhpCTbbO2FZz4XL62XnjcN1yWHx2uXWGBJTSJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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