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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e83a20e3aa25f9fd4224e7c306da21bcb51b22b5d1c7ff8c382f5c2b80b3fa' 
  AND token = 'tmouZ5Tcmuq9DDTqRBEweq6xi2sPOQGJrs5ftoGivds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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