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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5c411fc42df4ac55ec2bb603c1b357e2197848b7768d8063894ebd35290fbb' 
  AND token = 'HSR3rHeB/htZLhplk1j533r6MrYyCRyJmatqGLQSf4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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