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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1c7e930a5e33c75d7fa82807c3353a1fe3da03109e8a858b84b1a1dd793e63' 
  AND token = 'sEeZb69HTDinBLe3ZSU4moYNBe38RYcCN1DeyB/Cye8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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