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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd051b7a13e2281cc349b0776203098da16f7751b35a868fca41c10cd9d4e37fd' 
  AND token = 'C2Y0gnfUOBVszPgroqEE7YBOo2anIBowDJ1k97WSWsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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