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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e35b70dcc6af400cd661441658eec695dca149e6c509a2169b10ec85712bbdc' 
  AND token = 'b7rgTRQbQagM/iO1eViL0Tq+1BV6YEJ2q1UH4jgs+IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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