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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d29addc09bd8e0f400acbcf94ab953d32a8f4d3824ece85c3b759b4bd2d50a1' 
  AND token = 'MnrHddREJTTcxDPe1IGRPDzhRBYvuH2HChtWeARBlXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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