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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5ea262e6da42ec01a82ae21ccbad41284736fc25a33149d44510e5df733e1b' 
  AND token = 'phxhO2mazqkcNeoTpVyI0aUl/mnQtTyzss2kQohklO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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