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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec5d7b44ae42c3ef137a200c9eaf5767be0e52f4b5a7e4d5b3fd23c8b901dd0' 
  AND token = 't/ldzC1AMLqjJ2Aw/Yx3uEa4XJVs+hwgWfQK402C37o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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