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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c41af5713c0b429238a7aaaa3c441123bed046faf3a68795795ea83670d6e03' 
  AND token = 'c1hRJPv0r1PKSqx3NIe0OuYNoEuxcNNz1iZsOe5qmOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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