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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d3a75e0cf12b50b9409cc14507aa92842b05e8be61cfb9f0e3ebacfadbdeb2' 
  AND token = '7VcXl4s5JzsbXqr6uJv0cYqsx7Zbf12s9d62SFkg1R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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