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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c09adbe7d6770c8e7c8a3d4f85190d354530e8dbb5c234142b00f01950ba31' 
  AND token = '2K5DmPfSEXCmRDGf7QANKOLNBMzYj2iD6HmrtOIDrcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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