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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba125e2761f33f8b1230e865306b38265faa5ecbf0b0bde0034ae8a926fd3387' 
  AND token = 'IzDTKtovPxUTVNKxzzKdRCGiIrQC84ya3L5F0fq00pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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