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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9263cad5ae08f0fbe10cb7d5f7855c2c1e9d626d2702358eab957f32292bf1ab' 
  AND token = '9XWvm1k2Deb51i0qwMsEZmFj8mBWwD0BCwhDDfIN1Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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