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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4eff7c35003ea39ef49df1fed69ca77a086c9f2027e766c62f09f91a5ef4f32' 
  AND token = 'q2RqRhYXYVn02MYLaxFkiANQYHmBBR8/zgZWjQSr9+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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