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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd968192c95ed0e50286275b3f40904b2ce9cff18626428eea7879d0ae3eaea' 
  AND token = 'wminj/T9pf5VsD8x6Ybsfix524MMP/fIew2xtdTuGww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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