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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ffadbdd5d6bee85cdbe4326d4b3c50c5edafdf3b368194a7e4b814814d2ec9' 
  AND token = 'KysQq8ifPiyR5JGF9YM69hUmgRe1Lg+0we+hkbk/2uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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