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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10f842dd1bf294fd15dfda3a4851e6f9d756877ee214107314f0c83df86b2aa' 
  AND token = 'gcfDYnBG/bjSc/BZmXcVdAlfUMarLiaUj1fGZIQ18no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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