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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb80802ad805195c7271882f99b93a903e6bb0362e58c47ef30114fbab29b132' 
  AND token = 'c+AriKEJOUiYQ/m0NbbNIO1CSuyFDWD+1l7wULgj94s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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