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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf91ebd982dd860fb24c2fd098ee3e84a87f7c42f490cea89ffaf30b6db6772b' 
  AND token = 'un2auksTDVLBhVupun0tGlKPmscWJbQbKWTNbet4h+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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