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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89febd0a2fb4bd9c9ef023956c5864cd88b417549aaec341b1e12ccbb0dcfbac' 
  AND token = 'aHcYGVACr3/s1NnSBAfW/oykMBn3CsMG2GL5TxuBMKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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