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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0702bb5047733104e408e6d4f59414d13ed67699d935c5b6eb364ed3a0fe546' 
  AND token = 'ayU1VyJWHsTK9RPBTDBjxAieudHPJCnBpRbR1rtckFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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