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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0082b305145dc0c05cfe71d98d2a4d69f2b19ecc56f81a38421a2ab06b260c6' 
  AND token = 'H/7j5oIkKI8MgM1yD4bn5I83dfoWt1PHUnOwKIjO+v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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