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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0f2730fa55a56f6dba5560692ff92de0108dcc7ed24e0b7d5834786f43edf0' 
  AND token = 'Fyu5BYOp/r1NN7upoos8tu8HdpFGGrSHcwUXxen5uU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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