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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c484e0628b0db24fefcb3e39e39dc543365df7e0c0c5e6a839950510451e97b1' 
  AND token = 'yzlFWi1iy96NSPz9q8Hwv6pJapVW/6pu1R64u5MybpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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