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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87fe475cd987a7d111945584fa1a1d90280163dd97f599608cdce6202173faa' 
  AND token = 'ekABG2uUDYJCZd7XFw2AUsr1Y2n08Bx7kQp2tzHTWP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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