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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0446064871880fbcc4f9d6c774c22bfa3093c5b0412451534033ca51085a2c0c' 
  AND token = 'XrQgvyd5jVSUl94X63Cuten4vMzgKkPa4CWopsWHApo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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