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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27b83d2b71b55ebca03e6835311d5e96e9533b0236189781c780989f17e965c' 
  AND token = 'BixbTEo2bLKNZyRxfb1syJcZ8HPh/RCAYE/MK7izYWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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