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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97af14929ee7aacdfaedac9108367645869a18a6b3d8471b995cd97510d8da3' 
  AND token = '6R4rkrgFRvs/lXL+Ws0xF9E6LnA+sORETW2Hm1x0IFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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