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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77883a6cc33f5cf82f1c072ff25cb08e515d94457f6a0b31fe5d46148600307a' 
  AND token = 'RA7Gl49NCBytpnnidHlpL+SxgLJCIfOGsrlc0SBwUuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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